EP3531754B1 - Communication control device, communication control method, and computer program - Google Patents

Communication control device, communication control method, and computer program Download PDF

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Publication number
EP3531754B1
EP3531754B1 EP17862831.9A EP17862831A EP3531754B1 EP 3531754 B1 EP3531754 B1 EP 3531754B1 EP 17862831 A EP17862831 A EP 17862831A EP 3531754 B1 EP3531754 B1 EP 3531754B1
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EP
European Patent Office
Prior art keywords
wsd
wireless communication
communication control
control device
interference
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EP17862831.9A
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German (de)
English (en)
French (fr)
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EP3531754A1 (en
EP3531754A4 (en
Inventor
Sho FURUICHI
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Sony Group Corp
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Sony Group Corp
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Publication of EP3531754A4 publication Critical patent/EP3531754A4/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control

Definitions

  • the present disclosure relates to a communication control device, a communication control method, and a computer program.
  • frequency sharing As one measure for alleviating depletion of frequency resources in the future, frequency sharing is studied. For example, a mechanism for causing a frequency channel allocated to one wireless system to be temporarily utilized by another wireless system is studied. There is a case where such a mechanism is also referred to as frequency secondary utilization.
  • a system to which a frequency channel has been allocated by priority is called a primary system, and a system that secondarily utilizes the frequency channel is called a secondary system.
  • Patent Literature 1 discloses a technology of suppressing a case where communication by base stations becomes a cause of interference by frequencies being allocated in accordance with locations of the base stations.
  • US 2015/119014 A1 discloses a frequency management method.
  • a frequency management apparatus receives a notice regarding a change in the state of frequency use from a radio station under its own management, the frequency management apparatus sets acceptable transmit power for radio stations under its own management and radio stations managed by another frequency management apparatus, based on the notified change in the state of frequency.
  • the acceptable transmit power can be calculated using an interference reach area, which is the reach of interference from a secondary transmitting station in geographical terms. To increase efficiency in calculation, calculation targets are limited to secondary transmitting stations that need to be considered in terms of the geographic location.
  • ECC Report 186 which was issued in 2013 by the European Conference of Postal and Telecommunications Administrations (CEPT) and has legislated guidelines of TV White Space (TVWS) systems utilizing the geographic unused frequency band of a TV broadcast frequency band, as one of the guidelines, a method of calculating maximum allowable transmission power of a secondary system is regulated in order to protect a primary system against harmful aggregate interference.
  • ECC Report 186 a method of calculating maximum allowable transmission power of a secondary system is regulated in order to protect a primary system against harmful aggregate interference.
  • appropriate maximum allowable transmission power may not be calculated in the method regulated in ECC Report 186 in some cases.
  • the present disclosure proposes a novel and improved communication control device, communication control method, and computer program capable of calculating maximum allowable transmission power appropriately and with a small calculation load.
  • ECC Report 186 regulates three kinds of interference margin setting methods of calculating maximum allowable transmission power of a secondary system.
  • the three kinds of interference margin setting methods are a fixed/predetermined margin method, a flexible margin method, and a flexible minimized margin method.
  • An object of all three kinds of interference margin methods is to distribute an allowable given interference amount to a plurality of wireless communication devices so that an allowable interference amount is satisfied.
  • ECC Report 186 regulates a method of calculating maximum allowable transmission power of a secondary system in order to protect a primary system against harmful aggregate interference.
  • ECC Report 186 shows the validity of this through a computer simulation. In this simulation, however, it is assumed that only a master WSD operates, and thus calculation in consideration of slave WSDs that are connected to the master WSD to perform communication is not performed. In accordance with a calculation method regulated in ECC Report 186, it is easy to perform calculation in consideration of the slave WSDs. However, when the slave WSDs are considered, it is conceived that the following event occurs.
  • positional information of the slave WSDs is assumed to be fixed. In practice, however, not only is it conceived that the slave WSDs move, but an operation mode in which positional information regarding the slave WSDs is not required to be acquired is regulated in ETSI EN 301 598. It is practically difficult to calculate maximum allowable transmission power in consideration of the slave WSD operating in that operation mode.
  • the authors of the present disclosure have thoroughly examined a simple maximum allowable transmission power calculation method in which a calculation load is small and positional information regarding slave WSDs is not necessary.
  • the authors of the present disclosure have devised a technology for calculating maximum allowable transmission power simply and with a small calculation load by determining whether a WSD is an interference source on the basis of information regarding the WSD and calculating the maximum allowable transmission power on the basis of the determination result.
  • FIG. 1 is an explanatory diagram illustrating a logical architecture assumed according to an embodiment of the present disclosure. Each function in FIG. 1 will be described.
  • a database function is a logical entity that maintains information regarding communication devices of a secondary system, information regarding a primary business system (primary system), and the like and performs information management of the communication devices of the secondary system.
  • a geo-location function is a logical entity that performs calculation of operation parameters which are recommended for the communication devices of the secondary system and are required to be obeyed using information regarding positions of the communication devices of the secondary system.
  • a device control function is a logical entity that performs conversion to mutually understand a message which is notified of by the database function or the geo-location function or a message of which the database function or the geo-location function is notified by a communication device of the secondary system, or performs a change or the like of operation parameters of the communication device of the secondary system.
  • An interface function is a logical entity equivalent to a communication unit of each logical entity.
  • the communication function is an entity equivalent to a communication path between the logical entities.
  • FIG. 2 is an explanatory diagram illustrating a mounting example based on the logical architecture illustrated in FIG. 1.
  • FIG. 2 illustrates a mounting example of a geo-location database (GLDB) and a WSD.
  • the GLDB includes a database function, a geo-location function, and interface functions equivalent to communication units of the logical entities.
  • a communication device white space device: WSD
  • WSD white space device
  • FIG. 3 is an explanatory diagram illustrating a mounting example based on the logical architecture illustrated in FIG. 1 .
  • FIG. 3 illustrates a mounting example of a network coexistence technology (IEEE 802.19.1) for a British TVWS system.
  • a TVWS database of a third party includes a database function and a geo-location function, and interface functions equivalent to communication units of the logical entities.
  • a regulatory database includes a database function and an interface function equivalent to the communication unit of the database function.
  • the white space device includes a device control function and an interface function equivalent to the communication unit of the device control function.
  • FIG. 4 is an explanatory diagram illustrating a mounting example based on the logical architecture illustrated in FIG. 1 .
  • FIG. 4 illustrates an example in which a wireless access point performs control of a stationary device and is equivalent to, for example, a relation between a base station and a user terminal of a cellular system.
  • the wireless access point includes a database function, a geo-location function, and interface functions equivalent to communication units of the logical entities.
  • the stationary device includes a device control function and an interface function equivalent to a communication unit of the device control function.
  • FIG. 5 is an explanatory diagram illustrating a mounting example based on the logical architecture illustrated in FIG. 1 .
  • FIG. 5 illustrates an example in which a self-distributed wireless access point acquires information from a database installed on a network, voluntarily calculates operation parameters of the wireless access point on the basis of the acquired information, and sets the operation parameters.
  • the (autonomous) wireless access point includes a device function, a geo-location function, and interface functions equivalent to communication units of the logical entities.
  • the database includes a database function and an interface function equivalent to a communication unit of the database function.
  • mounting forms are not limited thereto. Any mounting form may be used as long as a modification or an application of the minimum configuration of the logical architecture illustrated in FIG. 1 is at least functionally embedded.
  • FIG. 6 is an explanatory diagram illustrating a configuration example of the communication control device according to the embodiment of the present disclosure.
  • the configuration example of the communication control device according to the embodiment of the present disclosure will be described with reference to FIG. 6 .
  • a communication control device 100 includes a height difference calculation unit 110 and a power calculation unit 120.
  • the height difference calculation unit 110 calculates a difference between an altitude of a reference point for calculating interference power including information regarding a height in a primary system and an altitude of a wireless communication device in a secondary system including a plurality of wireless communication devices sharing a frequency allocated to the primary system. A method in which the height difference calculation unit 110 calculates a difference in an altitude will be described in detail later.
  • the power calculation unit 120 calculates maximum allowable transmission power of the secondary system so that an allowable interference level of the primary system is satisfied, on the basis of whether the difference in the altitude calculated by the height difference calculation unit 110 satisfies a predetermined reference. Specifically, the power calculation unit 120 decides the maximum allowable transmission power of the secondary system so that an aggregate interference level by communication of an interference source that can occur at the reference point satisfies an allowable interference level of the primary system, using one or more wireless communication devices of the secondary systems for which the difference in the altitude calculated by the height difference calculation unit 110 is less than a predetermined value as the interference sources.
  • the communication control device 100 can be equivalent to, for example, the geo-location function in the logical architecture illustrated in FIG. 1 .
  • the communication control device 100 can calculate the maximum allowable transmission power simply and with a small calculation load by determining whether the WSD is an interference source on the basis of information regarding a height of the WSD and calculating the maximum allowable transmission power on the basis of the determination result.
  • a method of calculating allowable transmission power on the basis of a path loss value calculated on the basis of a distance from the position of the reference point will be described as a method of calculating allowable transmission power based on positional information.
  • ECC Report 186 regulates the following calculation expression as a method of performing calculation on the basis of a path loss value calculated on the basis of a distance from the position of a reference point.
  • the left side of the following expression is equivalent to a transmission power value of the communication device and the right side is equivalent to a calculation value of the maximum allowable transmission power of the communication device.
  • m G_dB is a coupling gain (a path gain value to which an antenna gain or the like is added and a path loss value to which an antenna gain or the like is added at -m G_dB ) between a reference point (the position of a television receiver or a wireless microphone in ECC Report 186) and a communication device.
  • the three kinds of methods are fixed margin based calculation, flexible margin based calculation, and flexible minimized margin based calculation.
  • the present disclosure is not limited to these calculation methods.
  • An important point when operation parameters of the WSD are calculated so that the aggregate interference given to the primary system by the plurality of WSDs satisfies the allowable value is which WSDs arc considered for the calculation.
  • the calculation may be performed in consideration of all the WSDs, but interference given to the primary system is ignorable in some cases depending on the positions of the WSDs.
  • the consideration of the WSDs of which the interference is ignorable becomes a factor that increases a calculation load of the GLDB.
  • IM that is, transmission power
  • IM is calculated on the basis of the number of WSDs. Therefore, adversely, the transmission power is excessively limited in the WSDs which do not contribute to the interference.
  • FIG. 7 is an explanatory diagram illustrating a difference in interference power in accordance with geography of a reference point and a WSD.
  • the reference point illustrated in FIG. 7 is, for example, the position of a primary system such as a wireless microphone in a frequency sharing scenario.
  • a WSD when transmission power control is performed in consideration of aggregate interference, a WSD is assumed to be considered for transmission power control performed in consideration of aggregate interference in a case in which it is determined that harmful interference is given to the reference point by the WSD due to geography and each ground height (altitude) in a positional relation between the reference point and the WSD. In a case in which it is determined that the harmful interference is not given to the reference point by the WSD, the WSD is assumed not to be considered for the transmission power control performed in consideration of the aggregate interference.
  • the communication control device 100 may determines whether the WSD is considered for the transmission power control performed in consideration of the aggregate interference by, for example, the following expression.
  • ⁇ h is any margin value. if h ReferencePoint ⁇ h WSD + ⁇ h WSD is considered for transmission power control else WSD is not considered for transmission power control end
  • FIG. 8 is a flowchart illustrating an operation example of a communication control device 100 according to the embodiment of the present disclosure.
  • FIG. 8 illustrates an operation example of the communication control device 100 when it is determined whether or not harmful interference is given to the reference point by the WSD by comparing the heights of the two spots of the reference point and the WSD, and then the transmission power control is performed.
  • an operation example of the communication control device 100 according to the embodiment of the present disclosure will be described with reference to FIG. 8 .
  • the communication control device 100 When the transmission power control is performed, the communication control device 100 first collects height information (altitude) of the WSD (step S101) and subsequently collects height information (altitude) of the reference point (step S102). The collection of the height information in steps S101 and S102 is performed by, for example, the height difference calculation unit 110. Note that the execution order of steps S101 and S102 may be reverse.
  • the height information of the WSD may be notified of by the WSD or information stored in the database function may be used.
  • the height information may be acquired from the regulatory database when the reference point is a wireless microphone or the like.
  • the specific position may be used.
  • the communication control device 100 subsequently determines whether the WSD of which the height information is collected in step S101 is considered for the transmission power control on the basis of the collected height information (step S103). This determination may be performed by the power calculation unit 120 on the basis of a difference between the altitudes of the WSD and the reference point calculated by the height difference calculation unit 110 or may be performed by the height difference calculation unit 110 on the basis of the difference between the altitudes of the WSD and the reference point calculated by the height difference calculation unit 110.
  • the communication control device 100 uses the above-described determination expression at the time of the determination of step S103. In a case in which it is determined as the result of the determination of step S103 that the WSD of which the height information is collected in step S101 is considered for the transmission power control (Yes in step S103), the communication control device 100 sends information regarding the WSD to the power calculation unit 120 (for example, the geo-location function) (step S104). In a case in which it is determined as the result of the determination of step S103 that the WSD of which the height information is collected in step S101 is not considered for the transmission power control (No in step S103), the communication control device 100 skips the process of step S104.
  • the power calculation unit 120 for example, the geo-location function
  • the power calculation unit 120 calculates the maximum allowable transmission power of the secondary system at any timing (step S105). Then, the communication control device 100 notifies all the WSDs which are targets of the transmission power control of a calculation result (step S106). The calculation result may be notified of in accordance with any method. In addition, the communication control device 100 may notify of information regarding the transmission power itself or may notify of information obtained by processing the information regarding the transmission power.
  • the communication control device 100 can determine whether the WSD is an interference source on the basis of the height information of the WSD by performing the above-described series of operations and can calculate the maximum allowable transmission power simply and with a small calculation load by calculating the maximum allowable transmission power on the basis of the determination result.
  • ETSI EN 301 598 regulates an operation mode in which a slave WSD connected to a master WSD to perform communication can operate without including a positioning function as in Global Navigation Satellite System (GNSS) (which is called a generic operation). Accordingly, it is considerably difficult to perform the transmission power control performed in consideration of aggregate interference in addition to the slave WSD of the generic operation.
  • GNSS Global Navigation Satellite System
  • the transmission power control performed in consideration of the aggregate interference is enabled in addition the slave WSD of the generic operation in accordance with the following methods.
  • a first method is a method of causing the geo-location function to recognize the number of slave WSDs (the number of slave WSDs per master WSD). This may be performed in any way.
  • the master WSD may count the number of serving slave WSDs and notify the geo-location function of the number of counted slave WSDs.
  • the master WSD may count the number of slave WSDs on the basis of the information.
  • the number of slave WSDs may be counted for each frequency channel.
  • the master WSD may set a coefficient in accordance with a separation width of the channel and set a number processed in accordance with the coefficient as the number of slave WSDs. That is, the number of slave WSDs may be any number by which contribution to the calculation of the interference is possible. Then, the communication control device 100 uses the number of finally recognized slave WSDs for the transmission power control performed in consideration of the aggregate interference. At this time, the transmission power control is the fixed margin method or the flexible margin method.
  • a second method is a method of determining whether a slave WSD is considered for the aggregate interference in accordance with the altitude of the serving maser WSD. It is conceived that most of the slave WSD are near the serving master WSD. Therefore, when there is information regarding the altitude of the master WSD, this information can be used although positional information or height information of the slave WSDs may not acquired.
  • this method adopts the above-described determination expression as follows. if h ReferencePoint ⁇ h MasterWSD + ⁇ h Master WSD and Slave WSDs communicating with Master WSD are considered for transmission power control else Master WSD and Slave WSDs communicating with Master WSD are not considered for transmission power control end
  • the communication control device 100 can also consider the slave WSDs served by the maser WSD for the transmission power control when the master WSD satisfies a condition even when slave WSD may not acquire the positional information or the height information.
  • FIG. 9 is an explanatory diagram illustrating an example of a positional relation between two spots of the reference point and the WSD.
  • a case in which a small hill is between the reference point and the WSD is conceived.
  • the WSD illustrated in FIG. 9 can be an interference source at the reference point.
  • the reference point since a small hill is between the reference point and the WSD, the reference point may not be seen from a place at which the WSD is located. Therefore, in the method of comparing the heights of the two spots of the reference point and the WSD, the WSD for which there is a considerably small possibility of being actually an interference source may be considered for the transmission power control.
  • the communication control device 100 approximately ascertains the path between the WSD and the reference point as follows.
  • the communication control device 100 voluntarily divides a map into divisions.
  • a division method is not limited to a specific pattern.
  • the communication control device 100 may use Ordnance Survey National Grid (OSNG).
  • OSNG Ordnance Survey National Grid
  • the communication control device 100 may use a division unit such as an address decided in advance administratively.
  • the communication control device 100 sets height information for each division when the map is divided into any division.
  • the height information may be any of an average value, a maximum value, and a minimum value of altitudes in each division. In this case, the height information is preferably the maximum value of the altitude in each division.
  • the communication control device 100 may set the height information using the height of the construction. Note that when there is information regarding heights decided in advance administratively, the communication control device 100 may set the height information using the information. In addition, when there is reliable data opened by any organization regardless of being public or private, the communication control device 100 may set the height information using the information.
  • the communication control device 100 may consider a reference height decided for each cluster class.
  • FIG. 10 is an explanatory diagram illustrating a setting example of height information in each division in a divided map.
  • the communication control device 100 maps each of the WSD and the reference point to the divided map and acquires height information set in the division. Further, the communication control device 100 acquires height information in the division which is between the WSD and the reference point.
  • the communication control device 100 determines whether the WSD is an interference source on the basis of the height information.
  • the communication control device 100 does not consider the WSD for the transmission power control and considers the WSD otherwise.
  • the height of the division which is between the WSD and the reference point is higher than the height of one of the WSD and the reference point by any value or less, but when a straight distance is any value or more, the communication control device 100 does not consider the WSD for the transmission power control and considers the WSD otherwise.
  • FIG. 11 is an explanatory diagram illustrating an example of a method of comparing heights of the WSD and the reference points.
  • the communication control device 100 acquires height information of divisions indicated by reference numerals r11 and r12 in FIG. 11 . Then, when the heights of the divisions indicated by reference numerals r11 and r12 are higher than the height of one of the WSD and the reference point by any value or more, the communication control device 100 does not consider the WSD for the transmission power control and considers the WSD otherwise.
  • the heights of the divisions indicated by reference numerals r11 and r12 are equal to r less than the height of one of the WSD and the reference point by any value or less, but when a straight distance is any value or more, the communication control device 100 does not consider the WSD for the transmission power control and considers the WSD otherwise.
  • the communication control device 100 passes over the plurality of divisions to be considered.
  • the communication control device 100 may perform determination with reference to only the height of any one division and may refer to the heights of all the divisions to be considered.
  • the communication control device 100 may select the highest height in all the divisions to be considered.
  • the communication control device 100 that performs the transmission power control of the WSDs using the altitude of the WSD and the altitude of the reference point.
  • the communication control device 100 can calculate the maximum allowable transmission power simply and with a small calculation load by performing the transmission power control of the WSDs using the altitude of the WSD and the altitude of the reference point.
  • a computer program for causing hardware such as a CPU, a ROM, and a RAM that is incorporated in each apparatus, to execute a function equivalent to the above-described configuration of each apparatus can also be created.
  • a storage medium storing the computer program can also be provided.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
EP17862831.9A 2016-10-20 2017-09-28 Communication control device, communication control method, and computer program Active EP3531754B1 (en)

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JP2016206026 2016-10-20
PCT/JP2017/035342 WO2018074177A1 (ja) 2016-10-20 2017-09-28 通信制御装置、通信制御方法及びコンピュータプログラム

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EP3531754A4 EP3531754A4 (en) 2019-10-23
EP3531754B1 true EP3531754B1 (en) 2021-09-08

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EP (1) EP3531754B1 (es)
JP (1) JP6988814B2 (es)
CN (1) CN109891952B (es)
MX (1) MX2019004335A (es)
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RU2737003C2 (ru) 2020-11-24
TW201817268A (zh) 2018-05-01
RU2019110994A (ru) 2020-10-12
US20190261282A1 (en) 2019-08-22
CN109891952B (zh) 2022-07-01
EP3531754A1 (en) 2019-08-28
MX2019004335A (es) 2019-07-15
JPWO2018074177A1 (ja) 2019-08-22
JP6988814B2 (ja) 2022-01-05
RU2019110994A3 (es) 2020-10-12
WO2018074177A1 (ja) 2018-04-26
US10863446B2 (en) 2020-12-08
ZA201901988B (en) 2019-10-30
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EP3531754A4 (en) 2019-10-23
CN109891952A (zh) 2019-06-14

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